EP2656997A1 - Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same - Google Patents

Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same Download PDF

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Publication number
EP2656997A1
EP2656997A1 EP12002833.7A EP12002833A EP2656997A1 EP 2656997 A1 EP2656997 A1 EP 2656997A1 EP 12002833 A EP12002833 A EP 12002833A EP 2656997 A1 EP2656997 A1 EP 2656997A1
Authority
EP
European Patent Office
Prior art keywords
injection
mould
gates
thermoplastic material
moulding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12002833.7A
Other languages
German (de)
French (fr)
Other versions
EP2656997B1 (en
Inventor
Arne Dr. Klaska
Dietmar Dr.-Ing. Gentsch
Dariusz Bednarowski
Lukasz Dr. Malinowski
Wenkai Dr.-Ing. Shang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Schweiz AG
Original Assignee
ABB Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP12002833.7A priority Critical patent/EP2656997B1/en
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to ES12002833T priority patent/ES2827212T3/en
Priority to PCT/EP2013/001212 priority patent/WO2013159907A1/en
Priority to RU2014146940A priority patent/RU2629067C2/en
Priority to IN8837DEN2014 priority patent/IN2014DN08837A/en
Priority to CN201380027552.5A priority patent/CN104334329B/en
Publication of EP2656997A1 publication Critical patent/EP2656997A1/en
Priority to US14/522,082 priority patent/US10183430B2/en
Application granted granted Critical
Publication of EP2656997B1 publication Critical patent/EP2656997B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14549—Coating rod-like, wire-like or belt-like articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14836—Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2703—Means for controlling the runner flow, e.g. runner switches, adjustable runners or gates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0027—Gate or gate mark locations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C2045/0089—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor successive filling of parts of a mould cavity, i.e. one cavity part being filled before another part is filled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • B29C2045/2714—Gates elongated, e.g. film-like, annular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C45/2708—Gates
    • B29C2045/2716—The gate axis being perpendicular to main injection axis, e.g. injecting into side walls of a container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C2045/2722—Nozzles or runner channels provided with a pressure sensor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C2045/279—Controlling the flow of material of two or more nozzles or gates to a single mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14008—Inserting articles into the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1671—Making multilayered or multicoloured articles with an insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens
    • H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
    • H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/662—Housings or protective screens

Definitions

  • the invention relates to a method for injection moulding of thermoplastic pole parts, with the use of a mould in which at least one vacuum interrupter and contact terminals are fixed during the moulding process, and with at least one injection opening/gate for injection of thermoplastic material into the mould, and mould for proceeding the same, according to the preamble of claims 1 and 9.
  • thermoplastic housing injection moulding of medium voltage pole parts, for example to cover them with a thermoplastic housing.
  • duroplastic material for a resin
  • the proceding pressure for thermoplastic material during the moulding is higher.
  • thermoplastic housing One of the greatest advantages of thermoplastic housing is, that the manufacture times are shorter than the manufacture times for epoxy resin.
  • Reason for that is, that epoxy resin needs longterm curing periodes and slow temperature curves. Thermoplastic material only has to become solid by cooling down.
  • thermoplastic pole parts Injection moulding technology for thermoplastic pole parts is used only with single injection gate or opening.
  • the filling of a cavity depends on the behaviour and the properties of thermoplastic materials, in scope of their resulting viscosity.
  • Geometric constraints require inhomogeneous wall thickness along flow path, and therefore voids occur, and incomplete filling at dedicated pressures is the possible result.
  • thermoplastic covered pole parts are quite short, so dynamic effects like viscosity of the liquid hot thermoplastic material occur during the process.
  • the mould is applied with multiple injection openings or gates or fim-injection gates at least along its long axis, for injection of hot thermoplastic material, and that the injection gates can be steared in such a way, that they inject thermoplastic material simultaneously or with a defined time dependend injection pattern.
  • An advantageous embodiment is, that further injection gates are located at that points in the mould where are located nonflat topography. This enhances a complete filling without time loss also at region with complicated topography. This furthermore results in a better mechanical as well as a better reduction of voids.
  • a further embodiment of the invention is, that the injection openings are applied with shutters, by which the flux of injected hot thermoplastic material can independently be steared for each injection opening.
  • shutters by which the flux of injected hot thermoplastic material can independently be steared for each injection opening.
  • the pressure in the injection openings or near to them are measured via pressure sensors in order to stear the injection of each injection opening e.g. each shutter according to a predetermined pressure gradient.
  • the injected hot thermoplastic material is filled with particles or fibres, and that at least dedicated injection openings are applied with that, in order, to strengthen at least several regions of the pole part.
  • the injection gates are steared or driven via the shutter and the applied pressure in such a way, that the direction of the resulting material flow in the mould during the moulding process can be steared or optimized.
  • At least two gates are applied with different hot thermoplastic material, in order to implement a two or more compound moulding during one moulding process.
  • the invention is, that the mould is applied with multiple injection gates at least along its long axis, for injection of hot thermoplastic material, and that at least one of the injection gates is applied with a steerable shutter.
  • a further advantageous embodiment to that is, that the shutter or the injection means are steared by stearing means, in which a pressure and or flux pattern is predetermined.
  • a further advantageous embodiment is, that in the injection gates or corresponding with them pressure sensors are located, and that the pressure sensor values are feed into the stearing means, in order to stear the shutter of injectors via a predetermined time/pressure pattern.
  • film injection gates can be used.
  • thermoplastic pole parts for indoor application are using multiple injection gates, in order to reduce viscosity-dependant pressure gradient along the long axis of the mould, so that it results in more homogenous housing of the pole parts and improve filling of the mould.
  • Figure 1 shows in principle a mould , with several injections openings or gates along the logaxis, of the mould, which is as well the flow path of the injected thermoplastic material.
  • the inserted positioned vacuum interrupter because it is not need to display it.
  • the injection gates 1, 2, 3, 4, 5 are applied in this case nearly equidistandly. But this is only an example, and it is not need in all cases to alligne them in that way in all cases. For example if regions of dense topography occur by given vacuum-interrupter- or inlay-construction the gates can be arranged nonequidistandly closes, that in other regions of the mould.
  • FIG. 1 The effect of such an arrangement of injection gates is shown on the right side of figure 1 .
  • the diagram shows the pressure gradient along the long axis or the flow path of the injected thermoplastic material.
  • Figure 2 shows according to figure 1 the comparison to the state of the art.
  • Figure 2 shows a mould with only one injection gate 1. It is clear, that the pressure decreases along the flow path of the thermoplastic material.
  • Figure 3 shows an embodiment in case of the use of additional inlays in the mould.
  • This additional inlays can be the electric terminals of the pole part. So the injection gates are located in such, that they are positioned near to that inlays.
  • the injection gates 1, 2 are furthermore positioned in that way, that a force F i is caused by injected material in that way and in that direction, that the inlay will be pushed into its predetermined end position. This gives a high performance in sense final measures and positioning of the manufacture of a pole part.
  • FIG 4 shows schematically an embodiment in use of the invention in case of general or additional film injection method. Also in this case the invention is implemented. Film injection gates 1, 2, 3, 4, 5, 6 can be applied from the inner and/or the outer side of the mould.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for injection moulding of thermoplastic pole parts, with the use of a mould in which at least one vacuum interrupter and contact terminals are fixed during the moulding procees, and with at least one injection opening or gate for injection of thermoplastic material into the mould, and mould for proceeding the same, according to the preamble of claims 1 and 9. In order to solve the problem with a pressure gradient along the long axis of the moulded pole part, and to result in shorte process times as well as in a homogenous dissipation of material during the moulding process, the mould is applied with multiple injection openings at least along its long axis, for injection of hot thermoplastic material, and that the injection openings or gates can be steared in such a way, that they inject thermoplastic material simultaneously or with a defined time dependend injection pattern.

Description

  • The invention relates to a method for injection moulding of thermoplastic pole parts, with the use of a mould in which at least one vacuum interrupter and contact terminals are fixed during the moulding process, and with at least one injection opening/gate for injection of thermoplastic material into the mould, and mould for proceeding the same, according to the preamble of claims 1 and 9.
  • injection moulding of medium voltage pole parts, for example to cover them with a thermoplastic housing is well known. In difference to the use of duroplastic material for a resin, the proceding pressure for thermoplastic material during the moulding is higher. One of the greatest advantages of thermoplastic housing is, that the manufacture times are shorter than the manufacture times for epoxy resin. Reason for that is, that epoxy resin needs longterm curing periodes and slow temperature curves. Thermoplastic material only has to become solid by cooling down.
  • Injection moulding technology for thermoplastic pole parts is used only with single injection gate or opening.
  • Furthermore due to inlays which are sensitive to pressure like for example the vacuum-interrupters, injection moulding is possible only to upper pressure limits.
  • The filling of a cavity depends on the behaviour and the properties of thermoplastic materials, in scope of their resulting viscosity.
  • So the disadvantages of the processes in the state of the art are the following:
    • The filling pressure decreases along flow path to low pressure at the end, caused by the viscosity of the thermoplastic material. This finally results in filling problems.
    • The maximum filling pressure inside the mould increases with height of the pole part or the pole part arrangement along the flow path.
  • Geometric constraints require inhomogeneous wall thickness along flow path, and therefore voids occur, and incomplete filling at dedicated pressures is the possible result.
  • The introduction of geometric reinforcement elements like fins etc. for strength and stiffness of pole part is almost impossible due to ineligible increase of cavity pressure.
  • Injection moulding of material with increased viscosity is with that known technology not possible.
  • So according to the fact, that the manufacture time cycles for thermoplastic covered pole parts are quite short, so dynamic effects like viscosity of the liquid hot thermoplastic material occur during the process.
  • Therefore it is an object of the invention, to solve the problem with a controlled pressure gradient along the long axis of the moulded pole part, and to result in shorter process times as well as in a homogenous dissipation of material during the moulding process.
  • The inventive solution of that problem is, that the mould is applied with multiple injection openings or gates or fim-injection gates at least along its long axis, for injection of hot thermoplastic material, and that the injection gates can be steared in such a way, that they inject thermoplastic material simultaneously or with a defined time dependend injection pattern.
  • An advantageous embodiment is, that further injection gates are located at that points in the mould where are located nonflat topography. This enhances a complete filling without time loss also at region with complicated topography. This furthermore results in a better mechanical as well as a better reduction of voids.
  • A further embodiment of the invention is, that the injection openings are applied with shutters, by which the flux of injected hot thermoplastic material can independently be steared for each injection opening. By these shutters each injection opening or gate can be steared in the optimal way, and with consideration of pressure gradient along the flow path of thermoplastic material.
  • It is an advantageous embodiment, that the pressure in the injection openings or near to them are measured via pressure sensors in order to stear the injection of each injection opening e.g. each shutter according to a predetermined pressure gradient.
  • In order to enhance the mechanical and the dielectric behavier and to cause reduction of voids of the pole part housing, the injected hot thermoplastic material is filled with particles or fibres, and that at least dedicated injection openings are applied with that, in order, to strengthen at least several regions of the pole part.
  • So in consequence of that, the injection gates are steared or driven via the shutter and the applied pressure in such a way, that the direction of the resulting material flow in the mould during the moulding process can be steared or optimized.
  • In order to use several material compounds it is advantageous, that at least two gates are applied with different hot thermoplastic material, in order to implement a two or more compound moulding during one moulding process.
  • According to a mould for the use of the method, the invention is, that the mould is applied with multiple injection gates at least along its long axis, for injection of hot thermoplastic material, and that at least one of the injection gates is applied with a steerable shutter.
  • A further advantageous embodiment to that is, that the shutter or the injection means are steared by stearing means, in which a pressure and or flux pattern is predetermined.
  • A further advantageous embodiment is, that in the injection gates or corresponding with them pressure sensors are located, and that the pressure sensor values are feed into the stearing means, in order to stear the shutter of injectors via a predetermined time/pressure pattern.
  • For all embodiments also film injection gates can be used.
  • One of the great advantages are, that thermoplastic pole parts for indoor application are using multiple injection gates, in order to reduce viscosity-dependant pressure gradient along the long axis of the mould, so that it results in more homogenous housing of the pole parts and improve filling of the mould.
  • By the fact, that the position of the injection openings or gates are choosen, it supports the alignment of inlays in the mould.
  • An embodiment of the invention is shown in the figures.
    • Figure 1: mould with several injection gates
    • Figure 2: state of the art
    • Figure 3: mould with additional use of inlays
    • Figure 4: mould with use of film injection gates
  • Figure 1 shows in principle a mould , with several injections openings or gates along the logaxis, of the mould, which is as well the flow path of the injected thermoplastic material. In the mould is not shown the inserted positioned vacuum interrupter, because it is not need to display it.
  • The injection gates 1, 2, 3, 4, 5 are applied in this case nearly equidistandly. But this is only an example, and it is not need in all cases to alligne them in that way in all cases. For example if regions of dense topography occur by given vacuum-interrupter- or inlay-construction the gates can be arranged nonequidistandly closes, that in other regions of the mould.
  • The effect of such an arrangement of injection gates is shown on the right side of figure 1. The diagram shows the pressure gradient along the long axis or the flow path of the injected thermoplastic material.
  • It is clear that the decrease of pressure caused by the viscosity of the thermoplastic material can be limited by the distance to the next injection gate.
  • Figure 2 shows according to figure 1 the comparison to the state of the art. Figure 2 shows a mould with only one injection gate 1. It is clear, that the pressure decreases along the flow path of the thermoplastic material.
  • So the difference becomes clear out the comparison of figure 1 with figure 2.
  • Figure 3 shows an embodiment in case of the use of additional inlays in the mould. This additional inlays can be the electric terminals of the pole part. So the injection gates are located in such, that they are positioned near to that inlays.
  • But a further detail in figure 3 is important. The injection gates 1, 2 are furthermore positioned in that way, that a force Fi is caused by injected material in that way and in that direction, that the inlay will be pushed into its predetermined end position. This gives a high performance in sense final measures and positioning of the manufacture of a pole part.
  • So finally with the invention the following resulting important features and advantages can be summarized.
    • An increased number of injection gates in the mould along the flow path.
    • A location of injection gates will be selected in such a way, that a maximum filling pressure is reduced compared to single injection gate, and the flow of material is much more homogenous in sense of high mechanical performance of the housing of the pole part. Furthermore a control of maximum filling pressures is possible, in order to consider each pressure sensitive inlay in such a pole part. The control of pressure profile along flow path is also possible, at least to consider several topography of the inlays, or of the outer surface of the pole part housing.
    • An almost constant filling pressure is possible, which keeps filling pressure inside mould at a dedicated level.
    • An alignment of glas fibre around vacuum-interrupter optimized concerning dielctric and mechanical strength is possible also in case of influence of viscosity by such additives in the hot thermoplastic material.
    • Furthermore a control of positions of weld lines by selection of moments for opening further gates, th.m. injection before or after flow front arrives at injection gate, is given, and a support of positioning, th.m. alignment to mould, or sealing, of inlays due to dedicated changes of filling direction is given by location of the injection gate beneficially on the opposite side of the inlay in the mould.
    • Furthermore the use of a defined injection angle, actually used 90° versus axial direction of pole part, can be applied by and/or each of the injection gates.
  • So the combination with complex structure elements, also possibly be caused by reinforcement elements, fine structures, far projected fins for mechanical reinforcement of pole part housing or increased creepage length, can be used in this moulding process as well.
  • Figure 4 shows schematically an embodiment in use of the invention in case of general or additional film injection method. Also in this case the invention is implemented. Film injection gates 1, 2, 3, 4, 5, 6 can be applied from the inner and/or the outer side of the mould.
  • They can be driven from the top or bottom side or as well from the sidewallposition or from the inner side of the so produced thermoplastic part. So all injection gates are steared in that way, described above.

Claims (12)

  1. Method for injection moulding of thermoplastic pole parts, with the use of a mould in which at least one vacuum interrupter and contact terminals are fixed during the moulding procees, and with at least one injection opening for injection of thermoplastic material into the mould,
    characterized in
    that the mould is applied with multiple injection openings or gates, or film-injection gates at least along its long axis, for injection of hot thermoplastic material, and that the injection gates can be steared or operated and are located in such a way, that they inject thermoplastic material simultaneously or with a defined time dependend injection pattern.
  2. Method according to claim 1,
    characterized in
    that further injection openings are located at that points in the mould where are located nonflat topography.
  3. Method according to claim 1,
    characterized in
    that the injection openings are applied with shutters, by which the flux of injected hot thermoplastic material can independently be steared for each injection opening.
  4. Method according to claim 1,
    characterized in
    that the pressure in the injection openings or gates or near to them are measured via pressure sensors in order to stear the injection of each injection opening or gate e.g. each shutter according to a predetermined pressure gradient.
  5. Method according to claim 1,
    characterized in
    that the injected hot thermoplastic material is filled with particles or fibres, and that at least dedicated injection openings or gates are applied with that, in order, to strengthen at least several regions of the pole part.
  6. Method according to claim 1,
    characterized in
    that the injection openings are steared via the shutter and the applied pressure in such a way, that the direction of the resulting material flow in the mould during the moulding process can be steared.
  7. Method according to claim 1,
    characterized in
    that at least two openings are applied with different hot thermoplastic material, in order to implement a two or more compound moulding during one moulding process.
  8. Method according to claim 1,
    characterized in
    that the injection is operated by at least partly using film injection gates from the inner or outer side of the produced thermoplastic part.
  9. Mould for the use of the method according to at least one of the aforesaid claims 1 to 8, for injection moulding of thermoplastic pole parts, in which at least one vacuum interrupter and contact terminals are fixed during the moulding procees, and with at least one injection opening or gates for injection of thermoplastic material into the mould,
    characterized in
    that the mould is applied with multiple injection openings or gates at least along its long axis, for injection of hot thermoplastic material, and that at least one of the injection opening or gate is applied with a steerable shutter.
  10. Mould according to claim 9,
    characterized in
    that the shutter or the injection means are steared by stearing means, in which a pressure and or flux pattern is predetermined.
  11. Mould according to claim 10,
    characterized in
    that in the injection openings or corresponding with them pressure sensors are located, and that the pressure sensor values are feed into the stearing means, in order to stear the shutter of injectors via a predetermined time/pressure pattern.
  12. Mould according to one of the claims 9 to 11,
    characterized in
    that at least a part of the injection gates are applied as film injection gates.
EP12002833.7A 2012-04-23 2012-04-23 Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same Active EP2656997B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
ES12002833T ES2827212T3 (en) 2012-04-23 2012-04-23 Method for injection molding thermoplastic pole pieces and its execution mold
EP12002833.7A EP2656997B1 (en) 2012-04-23 2012-04-23 Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same
RU2014146940A RU2629067C2 (en) 2012-04-23 2013-04-23 Method of forming under pressure of thermoplastic pole parts and casting form for implementating such
IN8837DEN2014 IN2014DN08837A (en) 2012-04-23 2013-04-23
PCT/EP2013/001212 WO2013159907A1 (en) 2012-04-23 2013-04-23 Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same
CN201380027552.5A CN104334329B (en) 2012-04-23 2013-04-23 For being injection moulded the method for thermoplasticity pole part and mould for implementing methods described
US14/522,082 US10183430B2 (en) 2012-04-23 2014-10-23 Method for injection molding of thermoplastic pole parts, and mold for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12002833.7A EP2656997B1 (en) 2012-04-23 2012-04-23 Method for injection moulding of thermoplastic pole parts, and mould for proceeding the same

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EP2656997A1 true EP2656997A1 (en) 2013-10-30
EP2656997B1 EP2656997B1 (en) 2020-08-12

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US (1) US10183430B2 (en)
EP (1) EP2656997B1 (en)
CN (1) CN104334329B (en)
ES (1) ES2827212T3 (en)
IN (1) IN2014DN08837A (en)
RU (1) RU2629067C2 (en)
WO (1) WO2013159907A1 (en)

Cited By (2)

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NL2011798C2 (en) * 2013-11-13 2015-05-19 Code Product Solutions B V Method for producing a component from thermoplastic materials as well as such an apparatus.
US11742114B2 (en) 2020-02-06 2023-08-29 Abb Schweiz Ag Bushing for a medium voltage switchgear

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JP6666082B2 (en) * 2015-06-23 2020-03-13 株式会社小糸製作所 Resin molding
CN108068270B (en) * 2017-12-05 2019-10-18 福耀玻璃工业集团股份有限公司 A kind of glass hemming assembly and its injection moulding process
CN109434066B (en) * 2018-10-27 2020-11-27 南京六创科技发展有限公司 Mold and mold design method
CN109501185A (en) * 2018-11-27 2019-03-22 湖北工业大学 Injection molding process on-line monitoring method

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GB1506851A (en) * 1975-06-05 1978-04-12 Jesman L Shortening mobile aerials
JPH08252838A (en) * 1995-01-19 1996-10-01 Mitsubishi Eng Plast Kk Method for coating molding of three-dimensional hollow molding
WO1998039150A2 (en) * 1997-03-07 1998-09-11 Cascade Engineering, Inc. Gas-assisted injection molding of large panels with sequential gating
JP2001179786A (en) * 1999-12-27 2001-07-03 Kanto Auto Works Ltd Injection molding machine having multipoint gate
WO2003057448A1 (en) * 2001-12-26 2003-07-17 Synventive Molding Solutions, Inc. Non-coaxial injection molding valve flow control
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US11742114B2 (en) 2020-02-06 2023-08-29 Abb Schweiz Ag Bushing for a medium voltage switchgear

Also Published As

Publication number Publication date
RU2014146940A (en) 2016-06-10
US10183430B2 (en) 2019-01-22
CN104334329B (en) 2017-12-12
CN104334329A (en) 2015-02-04
RU2629067C2 (en) 2017-08-24
EP2656997B1 (en) 2020-08-12
WO2013159907A1 (en) 2013-10-31
US20150042003A1 (en) 2015-02-12
ES2827212T3 (en) 2021-05-20
IN2014DN08837A (en) 2015-05-22
US20160243740A2 (en) 2016-08-25

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